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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
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Blood vessel formation starts early during embryonic development, around day 7. In the extraembryonic yolk sac, mesodermal precursor cells called hemangioblast proliferate and differentiate into angioblast. Angioblasts express vascular endothelial growth factor receptor 2 or VEGFR2, which binds VEGF-A, a proangiogenic factor, guiding blood vessel formation. VEGF signaling promotes angioblasts to form a blood island in the developing embryo. Angioblasts further differentiate, giving rise to...
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Related Experiment Video

Updated: Apr 30, 2026

A Simple Bioassay for the Evaluation of Vascular Endothelial Growth Factors
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Anti-vascular endothelial growth factor conundrum

P Mahesh Shanmugam1

  • 1Department of Vitreoretinal Services & Ocular Oncology, Sankara Eye Hospital, Bengaluru, Karnataka, India.

Indian Journal of Ophthalmology
|April 29, 2026
PubMed
Summary

No abstract available in PubMed .

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